7.2.6 Monitored dataTable 67:EF4PTOC Monitored dataName Type Values (Range) Unit DescriptionIOp REAL - A Operating current levelUPol REAL - kV Polarizing voltage levelIPol REAL - A Polarizing current levelUPOLIANG REAL - deg Angle betweenpolarizing voltage andoperating currentIPOLIANG REAL - deg Angle betweenpolarizing current andoperating current7.2.7 Operation principleThis function has the following three “Analog Inputs” on its function block in theconfiguration tool:1. I3P, input used for “Operating Quantity”.2. U3P, input used for “Voltage Polarizing Quantity”.3. I3PPOL, input used for “Current Polarizing Quantity”.These inputs are connected from the corresponding pre-processing function blocksin the Configuration Tool within PCM600.7.2.7.1 Operating quantity within the functionThe function always uses Residual Current (3I0) for its operating quantity. Theresidual current can be:1. directly measured (when a dedicated CT input of the IED is connected inPCM600 to the fourth analog input of the pre-processing block connected toEF4PTOC function input I3P). This dedicated IED CT input can be forexample, connected to:• parallel connection of current instrument transformers in all three phases(Holm-Green connection).• one single core balance, current instrument transformer (cable CT).• one single current instrument transformer located between power systemstar point and earth (that is, current transformer located in the star pointof a star connected transformer winding).• one single current instrument transformer located between two parts of aprotected object (that is, current transformer located between two starpoints of double star shunt capacitor bank).2. calculated from three-phase current input within the IED (when the fourthanalog input into the pre-processing block connected to EF4PTOC functionAnalog Input I3P is not connected to a dedicated CT input of the IED in1MRK 502 034-UEN - Section 7Current protection157Technical Manual
